libsystemd: split up into subdirs

We still only produce on .so, but let's keep the sources separate to make things a bit
less messy.

1 files changed, 1217 insertions, 0 deletions

diff --git a/src/libsystemd/sd-bus/bus-control.c b/src/libsystemd/sd-bus/bus-control.c
new file mode 100644
index 0000000000..e7e9ba07b0
--- /dev/null
+++ b/src/libsystemd/sd-bus/bus-control.c
@@ -0,0 +1,1217 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+#include <valgrind/memcheck.h>
+#endif
+
+#include <stddef.h>
+#include <errno.h>
+
+#include "strv.h"
+#include "sd-bus.h"
+#include "bus-internal.h"
+#include "bus-message.h"
+#include "bus-control.h"
+#include "bus-bloom.h"
+#include "bus-util.h"
+#include "cgroup-util.h"
+
+_public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
+        int r;
+
+        assert_return(bus, -EINVAL);
+        assert_return(unique, -EINVAL);
+        assert_return(!bus_pid_changed(bus), -ECHILD);
+
+        r = bus_ensure_running(bus);
+        if (r < 0)
+                return r;
+
+        *unique = bus->unique_name;
+        return 0;
+}
+
+static int bus_request_name_kernel(sd_bus *bus, const char *name, uint64_t flags) {
+        struct kdbus_cmd_name *n;
+        size_t size, l;
+        int r;
+
+        assert(bus);
+        assert(name);
+
+        l = strlen(name);
+        size = offsetof(struct kdbus_cmd_name, name) + l + 1;
+        n = alloca0(size);
+        n->size = size;
+        kdbus_translate_request_name_flags(flags, (uint64_t *) &n->flags);
+        memcpy(n->name, name, l+1);
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+        VALGRIND_MAKE_MEM_DEFINED(n, n->size);
+#endif
+
+        r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
+        if (r < 0)
+                return -errno;
+
+        if (n->flags & KDBUS_NAME_IN_QUEUE)
+                return 0;
+
+        return 1;
+}
+
+static int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        uint32_t ret, param = 0;
+        int r;
+
+        assert(bus);
+        assert(name);
+
+        if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
+                param |= BUS_NAME_ALLOW_REPLACEMENT;
+        if (flags & SD_BUS_NAME_REPLACE_EXISTING)
+                param |= BUS_NAME_REPLACE_EXISTING;
+        if (!(flags & SD_BUS_NAME_QUEUE))
+                param |= BUS_NAME_DO_NOT_QUEUE;
+
+        r = sd_bus_call_method(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/org/freedesktop/DBus",
+                        "org.freedesktop.DBus",
+                        "RequestName",
+                        NULL,
+                        &reply,
+                        "su",
+                        name,
+                        param);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply, "u", &ret);
+        if (r < 0)
+                return r;
+
+        if (ret == BUS_NAME_ALREADY_OWNER)
+                return -EALREADY;
+        else if (ret == BUS_NAME_EXISTS)
+                return -EEXIST;
+        else if (ret == BUS_NAME_IN_QUEUE)
+                return 0;
+        else if (ret == BUS_NAME_PRIMARY_OWNER)
+                return 1;
+
+        return -EIO;
+}
+
+_public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) {
+        assert_return(bus, -EINVAL);
+        assert_return(name, -EINVAL);
+        assert_return(bus->bus_client, -EINVAL);
+        assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
+        assert_return(!bus_pid_changed(bus), -ECHILD);
+        assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
+        assert_return(service_name_is_valid(name), -EINVAL);
+        assert_return(name[0] != ':', -EINVAL);
+
+        if (bus->is_kernel)
+                return bus_request_name_kernel(bus, name, flags);
+        else
+                return bus_request_name_dbus1(bus, name, flags);
+}
+
+static int bus_release_name_kernel(sd_bus *bus, const char *name) {
+        struct kdbus_cmd_name *n;
+        size_t l;
+        int r;
+
+        assert(bus);
+        assert(name);
+
+        l = strlen(name);
+        n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1);
+        n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
+        memcpy(n->name, name, l+1);
+
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+        VALGRIND_MAKE_MEM_DEFINED(n, n->size);
+#endif
+        r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
+        if (r < 0)
+                return -errno;
+
+        return n->flags;
+}
+
+static int bus_release_name_dbus1(sd_bus *bus, const char *name) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        uint32_t ret;
+        int r;
+
+        assert(bus);
+        assert(name);
+
+        r = sd_bus_call_method(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/org/freedesktop/DBus",
+                        "org.freedesktop.DBus",
+                        "ReleaseName",
+                        NULL,
+                        &reply,
+                        "s",
+                        name);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply, "u", &ret);
+        if (r < 0)
+                return r;
+        if (ret == BUS_NAME_NON_EXISTENT)
+                return -ESRCH;
+        if (ret == BUS_NAME_NOT_OWNER)
+                return -EADDRINUSE;
+        if (ret == BUS_NAME_RELEASED)
+                return 0;
+
+        return -EINVAL;
+}
+
+_public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
+        assert_return(bus, -EINVAL);
+        assert_return(name, -EINVAL);
+        assert_return(bus->bus_client, -EINVAL);
+        assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
+        assert_return(!bus_pid_changed(bus), -ECHILD);
+        assert_return(service_name_is_valid(name), -EINVAL);
+        assert_return(name[0] != ':', -EINVAL);
+
+        if (bus->is_kernel)
+                return bus_release_name_kernel(bus, name);
+        else
+                return bus_release_name_dbus1(bus, name);
+}
+
+static int kernel_get_list(sd_bus *bus, uint64_t flags, char ***x) {
+        struct kdbus_cmd_name_list cmd = {};
+        struct kdbus_name_list *name_list;
+        struct kdbus_cmd_name *name;
+        uint64_t previous_id = 0;
+        int r;
+
+        /* Caller will free half-constructed list on failure... */
+
+        cmd.flags = flags;
+
+        r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
+        if (r < 0)
+                return -errno;
+
+        name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
+
+        KDBUS_ITEM_FOREACH(name, name_list, names) {
+
+                if ((flags & KDBUS_NAME_LIST_UNIQUE) && name->owner_id != previous_id) {
+                        char *n;
+
+                        if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0)
+                                return -ENOMEM;
+
+                        r = strv_push(x, n);
+                        if (r < 0) {
+                                free(n);
+                                return -ENOMEM;
+                        }
+
+                        previous_id = name->owner_id;
+                }
+
+                if (name->size > sizeof(*name) && service_name_is_valid(name->name)) {
+                        r = strv_extend(x, name->name);
+                        if (r < 0)
+                                return -ENOMEM;
+                }
+        }
+
+        r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd.offset);
+        if (r < 0)
+                return -errno;
+
+        return 0;
+}
+
+static int bus_list_names_kernel(sd_bus *bus, char ***acquired, char ***activatable) {
+        _cleanup_strv_free_ char **x = NULL, **y = NULL;
+        int r;
+
+        if (acquired) {
+                r = kernel_get_list(bus, KDBUS_NAME_LIST_UNIQUE | KDBUS_NAME_LIST_NAMES, &x);
+                if (r < 0)
+                        return r;
+        }
+
+        if (activatable) {
+                r = kernel_get_list(bus, KDBUS_NAME_LIST_ACTIVATORS, &y);
+                if (r < 0)
+                        return r;
+
+                *activatable = y;
+                y = NULL;
+        }
+
+        if (acquired) {
+                *acquired = x;
+                x = NULL;
+        }
+
+        return 0;
+}
+
+static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_strv_free_ char **x = NULL, **y = NULL;
+        int r;
+
+        if (acquired) {
+                r = sd_bus_call_method(
+                                bus,
+                                "org.freedesktop.DBus",
+                                "/org/freedesktop/DBus",
+                                "org.freedesktop.DBus",
+                                "ListNames",
+                                NULL,
+                                &reply,
+                                NULL);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_read_strv(reply, &x);
+                if (r < 0)
+                        return r;
+
+                reply = sd_bus_message_unref(reply);
+        }
+
+        if (activatable) {
+                r = sd_bus_call_method(
+                                bus,
+                                "org.freedesktop.DBus",
+                                "/org/freedesktop/DBus",
+                                "org.freedesktop.DBus",
+                                "ListActivatableNames",
+                                NULL,
+                                &reply,
+                                NULL);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_read_strv(reply, &y);
+                if (r < 0)
+                        return r;
+
+                *activatable = y;
+                y = NULL;
+        }
+
+        if (acquired) {
+                *acquired = x;
+                x = NULL;
+        }
+
+        return 0;
+}
+
+_public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
+        assert_return(bus, -EINVAL);
+        assert_return(acquired || activatable, -EINVAL);
+        assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
+        assert_return(!bus_pid_changed(bus), -ECHILD);
+
+        if (bus->is_kernel)
+                return bus_list_names_kernel(bus, acquired, activatable);
+        else
+                return bus_list_names_dbus1(bus, acquired, activatable);
+}
+
+static int bus_get_owner_kdbus(
+                sd_bus *bus,
+                const char *name,
+                uint64_t mask,
+                sd_bus_creds **creds) {
+
+        _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
+        struct kdbus_cmd_conn_info *cmd;
+        struct kdbus_conn_info *conn_info;
+        struct kdbus_item *item;
+        size_t size;
+        uint64_t m, id;
+        int r;
+
+        r = bus_kernel_parse_unique_name(name, &id);
+        if (r < 0)
+                return r;
+        if (r > 0) {
+                size = offsetof(struct kdbus_cmd_conn_info, name);
+                cmd = alloca0(size);
+                cmd->id = id;
+        } else {
+                size = offsetof(struct kdbus_cmd_conn_info, name) + strlen(name) + 1;
+                cmd = alloca0(size);
+                strcpy(cmd->name, name);
+        }
+        cmd->flags = KDBUS_ATTACH_NAMES;
+
+        cmd->size = size;
+        r = ioctl(bus->input_fd, KDBUS_CMD_CONN_INFO, cmd);
+        if (r < 0)
+                return -errno;
+
+        conn_info = (struct kdbus_conn_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);
+
+        /* Non-activated names are considered not available */
+        if (conn_info->flags & KDBUS_HELLO_ACTIVATOR)
+                return name[0] == ':' ? -ENXIO : -ENOENT;
+
+        c = bus_creds_new();
+        if (!c)
+                return -ENOMEM;
+
+        if (mask & SD_BUS_CREDS_UNIQUE_NAME) {
+                if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) conn_info->id) < 0)
+                        return -ENOMEM;
+
+                c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
+        }
+
+        KDBUS_ITEM_FOREACH(item, conn_info, items) {
+
+                switch (item->type) {
+
+                case KDBUS_ITEM_CREDS:
+                        m = (SD_BUS_CREDS_UID | SD_BUS_CREDS_GID | SD_BUS_CREDS_PID) & mask;
+
+                        if (m) {
+                                c->uid = (uid_t) item->creds.uid;
+                                c->pid = (pid_t) item->creds.pid;
+                                c->gid = (gid_t) item->creds.gid;
+                                c->mask |= m;
+                        }
+
+                        if (mask & SD_BUS_CREDS_TID && item->creds.tid > 0) {
+                                c->tid = (pid_t) item->creds.tid;
+                                c->mask |= SD_BUS_CREDS_TID;
+                        }
+
+                        if (mask & SD_BUS_CREDS_PID_STARTTIME && item->creds.starttime > 0) {
+                                c->pid_starttime = item->creds.starttime;
+                                c->mask |= SD_BUS_CREDS_PID_STARTTIME;
+                        }
+
+                        break;
+
+                case KDBUS_ITEM_PID_COMM:
+                        if (mask & SD_BUS_CREDS_COMM) {
+                                c->comm = strdup(item->str);
+                                if (!c->comm) {
+                                        r = -ENOMEM;
+                                        goto fail;
+                                }
+
+                                c->mask |= SD_BUS_CREDS_COMM;
+                        }
+                        break;
+
+                case KDBUS_ITEM_TID_COMM:
+                        if (mask & SD_BUS_CREDS_TID_COMM) {
+                                c->tid_comm = strdup(item->str);
+                                if (!c->tid_comm) {
+                                        r = -ENOMEM;
+                                        goto fail;
+                                }
+
+                                c->mask |= SD_BUS_CREDS_TID_COMM;
+                        }
+                        break;
+
+                case KDBUS_ITEM_EXE:
+                        if (mask & SD_BUS_CREDS_EXE) {
+                                c->exe = strdup(item->str);
+                                if (!c->exe) {
+                                        r = -ENOMEM;
+                                        goto fail;
+                                }
+
+                                c->mask |= SD_BUS_CREDS_EXE;
+                        }
+                        break;
+
+                case KDBUS_ITEM_CMDLINE:
+                        if (mask & SD_BUS_CREDS_CMDLINE) {
+                                c->cmdline_size = item->size - KDBUS_ITEM_HEADER_SIZE;
+                                c->cmdline = memdup(item->data, c->cmdline_size);
+                                if (!c->cmdline) {
+                                        r = -ENOMEM;
+                                        goto fail;
+                                }
+
+                                c->mask |= SD_BUS_CREDS_CMDLINE;
+                        }
+                        break;
+
+                case KDBUS_ITEM_CGROUP:
+                        m = (SD_BUS_CREDS_CGROUP | SD_BUS_CREDS_UNIT |
+                             SD_BUS_CREDS_USER_UNIT | SD_BUS_CREDS_SLICE |
+                             SD_BUS_CREDS_SESSION | SD_BUS_CREDS_OWNER_UID) & mask;
+
+                        if (m) {
+                                c->cgroup = strdup(item->str);
+                                if (!c->cgroup) {
+                                        r = -ENOMEM;
+                                        goto fail;
+                                }
+
+                                if (!bus->cgroup_root) {
+                                        r = cg_get_root_path(&bus->cgroup_root);
+                                        if (r < 0)
+                                                goto fail;
+                                }
+
+                                c->cgroup_root = strdup(bus->cgroup_root);
+                                if (!c->cgroup_root) {
+                                        r = -ENOMEM;
+                                        goto fail;
+                                }
+
+                                c->mask |= m;
+                        }
+                        break;
+
+                case KDBUS_ITEM_CAPS:
+                        m = (SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_PERMITTED_CAPS |
+                             SD_BUS_CREDS_INHERITABLE_CAPS | SD_BUS_CREDS_BOUNDING_CAPS) & mask;
+
+                        if (m) {
+                                c->capability_size = item->size - KDBUS_ITEM_HEADER_SIZE;
+                                c->capability = memdup(item->data, c->capability_size);
+                                if (!c->capability) {
+                                        r = -ENOMEM;
+                                        goto fail;
+                                }
+
+                                c->mask |= m;
+                        }
+                        break;
+
+                case KDBUS_ITEM_SECLABEL:
+                        if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
+                                c->label = strdup(item->str);
+                                if (!c->label) {
+                                        r = -ENOMEM;
+                                        goto fail;
+                                }
+
+                                c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
+                        }
+                        break;
+
+                case KDBUS_ITEM_AUDIT:
+                        m = (SD_BUS_CREDS_AUDIT_SESSION_ID | SD_BUS_CREDS_AUDIT_LOGIN_UID) & mask;
+
+                        if (m) {
+                                c->audit_session_id = item->audit.sessionid;
+                                c->audit_login_uid = item->audit.loginuid;
+                                c->mask |= m;
+                        }
+                        break;
+
+                case KDBUS_ITEM_NAME:
+                        if ((mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) && service_name_is_valid(item->name.name)) {
+                                r = strv_extend(&c->well_known_names, item->name.name);
+                                if (r < 0)
+                                        goto fail;
+
+                                c->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
+                        }
+                        break;
+                }
+        }
+
+        if (creds) {
+                *creds = c;
+                c = NULL;
+        }
+
+        r = 0;
+
+fail:
+        ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd->offset);
+        return r;
+}
+
+static int bus_get_owner_dbus1(
+                sd_bus *bus,
+                const char *name,
+                uint64_t mask,
+                sd_bus_creds **creds) {
+
+        _cleanup_bus_message_unref_ sd_bus_message *reply_unique = NULL, *reply = NULL;
+        _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
+        const char *unique = NULL;
+        pid_t pid = 0;
+        int r;
+
+        /* Only query the owner if the caller wants to know it or if
+         * the caller just wants to check whether a name exists */
+        if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
+                r = sd_bus_call_method(
+                                bus,
+                                "org.freedesktop.DBus",
+                                "/org/freedesktop/DBus",
+                                "org.freedesktop.DBus",
+                                "GetNameOwner",
+                                NULL,
+                                &reply_unique,
+                                "s",
+                                name);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_read(reply_unique, "s", &unique);
+                if (r < 0)
+                        return r;
+        }
+
+        if (mask != 0) {
+                c = bus_creds_new();
+                if (!c)
+                        return -ENOMEM;
+
+                if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
+                        c->unique_name = strdup(unique);
+                        if (!c->unique_name)
+                                return -ENOMEM;
+
+                        c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
+                }
+
+                if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_GID|
+                            SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
+                            SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID|
+                            SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
+                            SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) {
+                        uint32_t u;
+
+                        r = sd_bus_call_method(
+                                        bus,
+                                        "org.freedesktop.DBus",
+                                        "/org/freedesktop/DBus",
+                                        "org.freedesktop.DBus",
+                                        "GetConnectionUnixProcessID",
+                                        NULL,
+                                        &reply,
+                                        "s",
+                                        unique ? unique : name);
+                        if (r < 0)
+                                return r;
+
+                        r = sd_bus_message_read(reply, "u", &u);
+                        if (r < 0)
+                                return r;
+
+                        pid = u;
+                        if (mask & SD_BUS_CREDS_PID) {
+                                c->pid = u;
+                                c->mask |= SD_BUS_CREDS_PID;
+                        }
+
+                        reply = sd_bus_message_unref(reply);
+                }
+
+                if (mask & SD_BUS_CREDS_UID) {
+                        uint32_t u;
+
+                        r = sd_bus_call_method(
+                                        bus,
+                                        "org.freedesktop.DBus",
+                                        "/org/freedesktop/DBus",
+                                        "org.freedesktop.DBus",
+                                        "GetConnectionUnixUser",
+                                        NULL,
+                                        &reply,
+                                        "s",
+                                        unique ? unique : name);
+                        if (r < 0)
+                                return r;
+
+                        r = sd_bus_message_read(reply, "u", &u);
+                        if (r < 0)
+                                return r;
+
+                        c->uid = u;
+                        c->mask |= SD_BUS_CREDS_UID;
+
+                        reply = sd_bus_message_unref(reply);
+                }
+
+                if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
+                        const void *p;
+                        size_t sz;
+
+                        r = sd_bus_call_method(
+                                        bus,
+                                        "org.freedesktop.DBus",
+                                        "/org/freedesktop/DBus",
+                                        "org.freedesktop.DBus",
+                                        "GetConnectionSELinuxSecurityContext",
+                                        NULL,
+                                        &reply,
+                                        "s",
+                                        unique ? unique : name);
+                        if (r < 0)
+                                return r;
+
+                        r = sd_bus_message_read_array(reply, 'y', &p, &sz);
+                        if (r < 0)
+                                return r;
+
+                        c->label = strndup(p, sz);
+                        if (!c->label)
+                                return -ENOMEM;
+
+                        c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
+                }
+
+                r = bus_creds_add_more(c, mask, pid, 0);
+                if (r < 0)
+                        return r;
+        }
+
+        if (creds) {
+                *creds = c;
+                c = NULL;
+        }
+
+        return 0;
+}
+
+_public_ int sd_bus_get_owner(
+                sd_bus *bus,
+                const char *name,
+                uint64_t mask,
+                sd_bus_creds **creds) {
+
+        assert_return(bus, -EINVAL);
+        assert_return(name, -EINVAL);
+        assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
+        assert_return(mask == 0 || creds, -EINVAL);
+        assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
+        assert_return(!bus_pid_changed(bus), -ECHILD);
+        assert_return(service_name_is_valid(name), -EINVAL);
+        assert_return(bus->bus_client, -ENODATA);
+
+        if (bus->is_kernel)
+                return bus_get_owner_kdbus(bus, name, mask, creds);
+        else
+                return bus_get_owner_dbus1(bus, name, mask, creds);
+}
+
+static int add_name_change_match(sd_bus *bus,
+                                 uint64_t cookie,
+                                 const char *name,
+                                 const char *old_owner,
+                                 const char *new_owner) {
+
+        uint64_t name_id = KDBUS_MATCH_ID_ANY, old_owner_id = 0, new_owner_id = 0;
+        int is_name_id = -1, r;
+        struct kdbus_item *item;
+
+        assert(bus);
+
+        /* If we encounter a match that could match against
+         * NameOwnerChanged messages, then we need to create
+         * KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} and
+         * KDBUS_ITEM_ID_{ADD,REMOVE} matches for it, possibly
+         * multiple if the match is underspecified.
+         *
+         * The NameOwnerChanged signals take three parameters with
+         * unique or well-known names, but only some forms actually
+         * exist:
+         *
+         * WELLKNOWN, "", UNIQUE       → KDBUS_ITEM_NAME_ADD
+         * WELLKNOWN, UNIQUE, ""       → KDBUS_ITEM_NAME_REMOVE
+         * WELLKNOWN, UNIQUE, UNIQUE   → KDBUS_ITEM_NAME_CHANGE
+         * UNIQUE, "", UNIQUE          → KDBUS_ITEM_ID_ADD
+         * UNIQUE, UNIQUE, ""          → KDBUS_ITEM_ID_REMOVE
+         *
+         * For the latter two the two unique names must be identical.
+         *
+         * */
+
+        if (name) {
+                is_name_id = bus_kernel_parse_unique_name(name, &name_id);
+                if (is_name_id < 0)
+                        return 0;
+        }
+
+        if (!isempty(old_owner)) {
+                r = bus_kernel_parse_unique_name(old_owner, &old_owner_id);
+                if (r < 0)
+                        return 0;
+                if (r == 0)
+                        return 0;
+                if (is_name_id > 0 && old_owner_id != name_id)
+                        return 0;
+        } else
+                old_owner_id = KDBUS_MATCH_ID_ANY;
+
+        if (!isempty(new_owner)) {
+                r = bus_kernel_parse_unique_name(new_owner, &new_owner_id);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        return 0;
+                if (is_name_id > 0 && new_owner_id != name_id)
+                        return 0;
+        } else
+                new_owner_id = KDBUS_MATCH_ID_ANY;
+
+        if (is_name_id <= 0) {
+                struct kdbus_cmd_match *m;
+                size_t sz, l;
+
+                /* If the name argument is missing or is a well-known
+                 * name, then add KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE}
+                 * matches for it */
+
+                l = name ? strlen(name) + 1 : 0;
+
+                sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
+                            offsetof(struct kdbus_item, name_change) +
+                            offsetof(struct kdbus_notify_name_change, name) +
+                            l);
+
+                m = alloca0(sz);
+                m->size = sz;
+                m->cookie = cookie;
+
+                item = m->items;
+                item->size =
+                        offsetof(struct kdbus_item, name_change) +
+                        offsetof(struct kdbus_notify_name_change, name) +
+                        l;
+
+                item->name_change.old.id = old_owner_id;
+                item->name_change.new.id = new_owner_id;
+
+                if (name)
+                        memcpy(item->name_change.name, name, l);
+
+                /* If the old name is unset or empty, then
+                 * this can match against added names */
+                if (!old_owner || old_owner[0] == 0) {
+                        item->type = KDBUS_ITEM_NAME_ADD;
+
+                        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
+                        if (r < 0)
+                                return -errno;
+                }
+
+                /* If the new name is unset or empty, then
+                 * this can match against removed names */
+                if (!new_owner || new_owner[0] == 0) {
+                        item->type = KDBUS_ITEM_NAME_REMOVE;
+
+                        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
+                        if (r < 0)
+                                return -errno;
+                }
+
+                /* The CHANGE match we need in either case, because
+                 * what is reported as a name change by the kernel
+                 * might just be an owner change between starter and
+                 * normal clients. For userspace such a change should
+                 * be considered a removal/addition, hence let's
+                 * subscribe to this unconditionally. */
+                item->type = KDBUS_ITEM_NAME_CHANGE;
+                r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
+                if (r < 0)
+                        return -errno;
+        }
+
+        if (is_name_id != 0) {
+                struct kdbus_cmd_match *m;
+                uint64_t sz;
+
+                /* If the name argument is missing or is a unique
+                 * name, then add KDBUS_ITEM_ID_{ADD,REMOVE} matches
+                 * for it */
+
+                sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
+                            offsetof(struct kdbus_item, id_change) +
+                            sizeof(struct kdbus_notify_id_change));
+
+                m = alloca0(sz);
+                m->size = sz;
+                m->cookie = cookie;
+
+                item = m->items;
+                item->size =
+                        offsetof(struct kdbus_item, id_change) +
+                        sizeof(struct kdbus_notify_id_change);
+                item->id_change.id = name_id;
+
+                /* If the old name is unset or empty, then this can
+                 * match against added ids */
+                if (!old_owner || old_owner[0] == 0) {
+                        item->type = KDBUS_ITEM_ID_ADD;
+
+                        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
+                        if (r < 0)
+                                return -errno;
+                }
+
+                /* If thew new name is unset or empty, then this can
+                 * match against removed ids */
+                if (!new_owner || new_owner[0] == 0) {
+                        item->type = KDBUS_ITEM_ID_REMOVE;
+
+                        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
+                        if (r < 0)
+                                return -errno;
+                }
+        }
+
+        return 0;
+}
+
+int bus_add_match_internal_kernel(
+                sd_bus *bus,
+                uint64_t id,
+                struct bus_match_component *components,
+                unsigned n_components,
+                uint64_t cookie) {
+
+        struct kdbus_cmd_match *m;
+        struct kdbus_item *item;
+        uint64_t bloom[BLOOM_SIZE/8];
+        size_t sz;
+        const char *sender = NULL;
+        size_t sender_length = 0;
+        uint64_t src_id = KDBUS_MATCH_ID_ANY;
+        bool using_bloom = false;
+        unsigned i;
+        bool matches_name_change = true;
+        const char *name_change_arg[3] = {};
+        int r;
+
+        assert(bus);
+
+        zero(bloom);
+
+        sz = ALIGN8(offsetof(struct kdbus_cmd_match, items));
+
+        for (i = 0; i < n_components; i++) {
+                struct bus_match_component *c = &components[i];
+
+                switch (c->type) {
+
+                case BUS_MATCH_SENDER:
+                        if (!streq(c->value_str, "org.freedesktop.DBus"))
+                                matches_name_change = false;
+
+                        r = bus_kernel_parse_unique_name(c->value_str, &src_id);
+                        if (r < 0)
+                                return r;
+                        else if (r > 0)
+                                sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t));
+                        else  {
+                                sender = c->value_str;
+                                sender_length = strlen(sender);
+                                sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
+                        }
+
+                        break;
+
+                case BUS_MATCH_MESSAGE_TYPE:
+                        if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL)
+                                matches_name_change = false;
+
+                        bloom_add_pair(bloom, "message-type", bus_message_type_to_string(c->value_u8));
+                        using_bloom = true;
+                        break;
+
+                case BUS_MATCH_INTERFACE:
+                        if (!streq(c->value_str, "org.freedesktop.DBus"))
+                                matches_name_change = false;
+
+                        bloom_add_pair(bloom, "interface", c->value_str);
+                        using_bloom = true;
+                        break;
+
+                case BUS_MATCH_MEMBER:
+                        if (!streq(c->value_str, "NameOwnerChanged"))
+                                matches_name_change = false;
+
+                        bloom_add_pair(bloom, "member", c->value_str);
+                        using_bloom = true;
+                        break;
+
+                case BUS_MATCH_PATH:
+                        if (!streq(c->value_str, "/org/freedesktop/DBus"))
+                                matches_name_change = false;
+
+                        bloom_add_pair(bloom, "path", c->value_str);
+                        using_bloom = true;
+                        break;
+
+                case BUS_MATCH_PATH_NAMESPACE:
+                        if (!streq(c->value_str, "/")) {
+                                bloom_add_pair(bloom, "path-slash-prefix", c->value_str);
+                                using_bloom = true;
+                        }
+                        break;
+
+                case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: {
+                        char buf[sizeof("arg")-1 + 2 + 1];
+
+                        if (c->type - BUS_MATCH_ARG < 3)
+                                name_change_arg[c->type - BUS_MATCH_ARG] = c->value_str;
+
+                        snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG);
+                        bloom_add_pair(bloom, buf, c->value_str);
+                        using_bloom = true;
+                        break;
+                }
+
+                case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
+                        char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
+
+                        snprintf(buf, sizeof(buf), "arg%u-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
+                        bloom_add_pair(bloom, buf, c->value_str);
+                        using_bloom = true;
+                        break;
+                }
+
+                case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
+                        char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
+
+                        snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
+                        bloom_add_pair(bloom, buf, c->value_str);
+                        using_bloom = true;
+                        break;
+                }
+
+                case BUS_MATCH_DESTINATION:
+                        /* The bloom filter does not include
+                           the destination, since it is only
+                           available for broadcast messages
+                           which do not carry a destination
+                           since they are undirected. */
+                        break;
+
+                case BUS_MATCH_ROOT:
+                case BUS_MATCH_VALUE:
+                case BUS_MATCH_LEAF:
+                case _BUS_MATCH_NODE_TYPE_MAX:
+                case _BUS_MATCH_NODE_TYPE_INVALID:
+                        assert_not_reached("Invalid match type?");
+                }
+        }
+
+        if (using_bloom)
+                sz += ALIGN8(offsetof(struct kdbus_item, data64) + BLOOM_SIZE);
+
+        m = alloca0(sz);
+        m->size = sz;
+        m->cookie = cookie;
+        m->owner_id = id;
+
+        item = m->items;
+
+        if (src_id != KDBUS_MATCH_ID_ANY) {
+                item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t);
+                item->type = KDBUS_ITEM_ID;
+                item->id = src_id;
+                item = KDBUS_ITEM_NEXT(item);
+        }
+
+        if (using_bloom) {
+                item->size = offsetof(struct kdbus_item, data64) + BLOOM_SIZE;
+                item->type = KDBUS_ITEM_BLOOM;
+                memcpy(item->data64, bloom, BLOOM_SIZE);
+                item = KDBUS_ITEM_NEXT(item);
+        }
+
+        if (sender) {
+                item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
+                item->type = KDBUS_ITEM_NAME;
+                memcpy(item->str, sender, sender_length + 1);
+        }
+
+        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
+        if (r < 0)
+                return -errno;
+
+        if (matches_name_change) {
+
+                /* If this match could theoretically match
+                 * NameOwnerChanged messages, we need to
+                 * install a second non-bloom filter explitly
+                 * for it */
+
+                r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+static int bus_add_match_internal_dbus1(
+                sd_bus *bus,
+                const char *match) {
+
+        assert(bus);
+        assert(match);
+
+        return sd_bus_call_method(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/org/freedesktop/DBus",
+                        "org.freedesktop.DBus",
+                        "AddMatch",
+                        NULL,
+                        NULL,
+                        "s",
+                        match);
+}
+
+int bus_add_match_internal(
+                sd_bus *bus,
+                const char *match,
+                struct bus_match_component *components,
+                unsigned n_components,
+                uint64_t cookie) {
+
+        assert(bus);
+        assert(match);
+
+        if (bus->is_kernel)
+                return bus_add_match_internal_kernel(bus, 0, components, n_components, cookie);
+        else
+                return bus_add_match_internal_dbus1(bus, match);
+}
+
+int bus_remove_match_internal_kernel(
+                sd_bus *bus,
+                uint64_t id,
+                uint64_t cookie) {
+
+        struct kdbus_cmd_match m;
+        int r;
+
+        assert(bus);
+
+        zero(m);
+        m.size = offsetof(struct kdbus_cmd_match, items);
+        m.cookie = cookie;
+        m.owner_id = id;
+
+        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
+        if (r < 0)
+                return -errno;
+
+        return 0;
+}
+
+static int bus_remove_match_internal_dbus1(
+                sd_bus *bus,
+                const char *match) {
+
+        assert(bus);
+        assert(match);
+
+        return sd_bus_call_method(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/org/freedesktop/DBus",
+                        "org.freedesktop.DBus",
+                        "RemoveMatch",
+                        NULL,
+                        NULL,
+                        "s",
+                        match);
+}
+
+int bus_remove_match_internal(
+                sd_bus *bus,
+                const char *match,
+                uint64_t cookie) {
+
+        assert(bus);
+        assert(match);
+
+        if (bus->is_kernel)
+                return bus_remove_match_internal_kernel(bus, 0, cookie);
+        else
+                return bus_remove_match_internal_dbus1(bus, match);
+}
+
+_public_ int sd_bus_get_owner_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
+        const char *mid;
+        int r;
+
+        assert_return(bus, -EINVAL);
+        assert_return(name, -EINVAL);
+        assert_return(machine, -EINVAL);
+        assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
+        assert_return(!bus_pid_changed(bus), -ECHILD);
+        assert_return(service_name_is_valid(name), -EINVAL);
+
+        if (streq_ptr(name, bus->unique_name))
+                return sd_id128_get_machine(machine);
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        name,
+                        "/",
+                        "org.freedesktop.DBus.Peer",
+                        "GetMachineId", &m);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_set_no_auto_start(m, true);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_call(bus, m, 0, NULL, &reply);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply, "s", &mid);
+        if (r < 0)
+                return r;
+
+        return sd_id128_from_string(mid, machine);
+}